package com.github.icloudpay.pay.core.util;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

import net.sf.json.JSONObject;

import org.apache.commons.codec.binary.Base64;
import org.springframework.util.StringUtils;

/** 
 * 编码工具类 
 * 1.将byte[]转为各种进制的字符串 
 * 2.base 64 encode 
 * 3.base 64 decode 
 * 4.获取byte[]的md5值 
 * 5.获取字符串md5值 
 * 6.结合base64实现md5加密 
 * 7.AES加密 
 * 8.AES加密为base 64 code 
 * 9.AES解密 
 * 10.将base 64 code AES解密 
 */  
public class AESUtils {
	
	public static void main(String[] args) throws Exception {  
		
		byte[] ss = new Base64().encode("333".getBytes());
		String dd = new String(ss);
		System.out.println(dd);
		byte[] ff = new Base64().decode(dd.getBytes());
		System.out.println(new String(ff));
		
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("merCustNo", "05524169");
		map.put("orderType", "00");
		map.put("merOrderNo", "055241691498118608265");
		map.put("orderStatus", "00");
		JSONObject json = JSONObject.fromObject(map);
        System.out.println("加密前：" + json.toString());  
  
        String key = "21232f297a57a5a743894a0e4a801fc3";  
        System.out.println("加密密钥和解密密钥：" + key);  
          
        String encrypt = encrypt(json.toString(), key);  
        System.out.println("加密后：" + encrypt);  
        byte[] a = base64Decode(encrypt);
        String decrypt = decrypt("UpxJZ5jhBDmrdxeLwmEZr7ucoVu1w5QT/dJcZ+SlGuF2r/1AJeqEY0rdmxLmqwzuUmcX9orT6jwdZ+nM7ByOsPRSDfObBOO5cgEkTSiiiro=", key);  
        System.out.println("解密后：" + decrypt); 
        System.out.println(new String(a));
    }  
      
    /** 
     * 将byte[]转为各种进制的字符串 
     * @param bytes byte[] 
     * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制 
     * @return 转换后的字符串 
     */  
    public static String binary(byte[] bytes, int radix){  
        return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数  
    }  
      
    /** 
     * base 64 encode 
     * @param bytes 待编码的byte[] 
     * @return 编码后的base 64 code 
     */  
    public static byte[] base64Encode(byte[] bytes){  
        return new Base64().encode(bytes);
    }  
      
    /** 
     * base 64 decode 
     * @param base64Code 待解码的base 64 code 
     * @return 解码后的byte[] 
     * @throws Exception 
     */  
    public static byte[] base64Decode(String base64Code) throws Exception{  
        return isEmpty(base64Code) ? null : new Base64().decode(base64Code);
    }  
      
    /** 
     * 获取byte[]的md5值 
     * @param bytes byte[] 
     * @return md5 
     * @throws Exception 
     */  
    public static byte[] md5(byte[] bytes) throws Exception {  
        MessageDigest md = MessageDigest.getInstance("MD5");  
        md.update(bytes);  
          
        return md.digest();  
    }  
      
    /** 
     * 获取字符串md5值 
     * @param msg  
     * @return md5 
     * @throws Exception 
     */  
    public static byte[] md5(String msg) throws Exception {  
        return isEmpty(msg) ? null : md5(msg.getBytes());  
    }  
      
    /** 
     * 结合base64实现md5加密 
     * @param msg 待加密字符串 
     * @return 获取md5后转为base64 
     * @throws Exception 
     */  
    public static String md5Encrypt(String msg) throws Exception{  
        return isEmpty(msg) ? null : new String(base64Encode(md5(msg)));  
    }  
      
    /** 
     * AES加密 
     * @param content 待加密的内容 
     * @param encryptKey 加密密钥 
     * @return 加密后的byte[] 
     * @throws Exception 
     */  
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception { 
    	
    	KeyGenerator _generator = KeyGenerator.getInstance( "AES" );
    	SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
    	secureRandom.setSeed(encryptKey.getBytes());
    	_generator.init(128,secureRandom);
		Cipher cipher = Cipher.getInstance("AES");  
		cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(_generator.generateKey().getEncoded(), "AES"));  
			  
		return cipher.doFinal(content.getBytes("utf-8")); 
        
    }  
      
    /** 
     * AES加密为base 64 code 
     * @param content 待加密的内容 
     * @param encryptKey 加密密钥 
     * @return 加密后的base 64 code 
     * @throws Exception 
     */  
    public static String encrypt(String content, String encryptKey) throws Exception {  
    	System.out.println(aesEncryptToBytes(content, encryptKey));
        return new String(base64Encode(aesEncryptToBytes(content, encryptKey)));  
    }  
      
    /** 
     * AES解密 
     * @param encryptBytes 待解密的byte[] 
     * @param decryptKey 解密密钥 
     * @return 解密后的String 
     * @throws Exception 
     */  
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {  
    	KeyGenerator _generator = KeyGenerator.getInstance( "AES" );
    	SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
    	secureRandom.setSeed(decryptKey.getBytes());
    	_generator.init(128,secureRandom);
        Cipher cipher = Cipher.getInstance("AES");  
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(_generator.generateKey().getEncoded(), "AES"));  
        byte[] decryptBytes = cipher.doFinal(encryptBytes);  
          
        return new String(decryptBytes);  
    }  
      
    /** 
     * 将base 64 code AES解密 
     * @param encryptStr 待解密的base 64 code 
     * @param decryptKey 解密密钥 
     * @return 解密后的string 
     * @throws Exception 
     */  
    public static String decrypt(String encryptStr, String decryptKey) throws Exception {  
        return isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);  
    }

    private static boolean isEmpty(String encryptStr){
    	if(!StringUtils.hasText(encryptStr)){
    		return true;
    	}else{
    		return false;
    	}
    }
}
